Preparation method and application of three-dimensional graphene-based stannic oxide composite material

Abstract

The invention discloses a preparation method and an application of a graphene-based stannic oxide composite material with a three-dimensional structure. The preparation method disclosed by the invention is characterized in that graphene with a single-layer carbon atomic structure is used as a carrier, stannic chloride pentahydrate is used as a tin source precursor, and the graphene-based stannic oxide composite material with the three-dimensional structure is prepared through a hydrothermal freeze-dried method. The stannic oxide nanometer particles obtained by the method are uniformly loaded on a graphene skeleton to be assembled into aerogel with the three-dimensional structure very well. The electrochemical test proves that the graphene-based stannic oxide composite material with the three-dimensional structure obtained by the preparation method has excellent circulation stability and rate capability. Experiments prove that the discharge capacity of the stannic oxide material can reach 800mAh.g<-1> in 100mAh.g<-1> charge-discharge currents.

Description

technical field [0001] The invention relates to a method and application of a graphene-based tin dioxide composite material with a three-dimensional structure, and belongs to the fields of material science and electrochemical technology. Background technique [0002] With the increasingly prominent energy and environmental issues, the new energy industry has received more and more attention. The hybrid electric vehicle and electric vehicle industries are developing rapidly, and lithium-ion batteries are widely used as an important energy storage device. Lithium-ion batteries have some excellent properties such as high energy density and good cycle performance, and are considered to be one of the most effective energy storage methods at present. Therefore, further improving their energy density and cycle performance is also a difficult and hot topic of current research. [0003] The negative electrode of a lithium-ion battery is an important part of the battery, and its stru...

AI Technical Summary

Problems solved by technology

At present, graphite is the main anode material for commercial lithium-ion batteries. Graphite has low cost and wide sources, and is suitable for commercialization; however, its capacity is relatively low, and its theoretical capacity is only 372mAhg. -1 , which is limited when applied in fields requiring high energy output

[0004] Metal oxides such as Fe 3 o 4 , SnO 2 As a negative electrode material for lithium-ion batteries, it has a high specific capacity, and its specific capacity is as high as 700-1000mAhg -1 ; but most metal oxides, especially SnO 2 As an electrode material, the volume change is as high as 200-300% during the charging and discharging process, which will cause the pulverization of the electrode, resulting in the disconnection of the active material and the current collector.

Therefore, most metal oxides have the problem of rapid capacity decay when used as electrodes of lithium-ion batteries, which also limits the development and practical application of metal oxides as anode materials for lithium-ion batteries.

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